The employees may have been exposed to measles after a San Mateo resident diagnosed with the virus “spent some time” at the Mountain View headquarters within the last couple of weeks, said health officials, who also would not confirm whether the San Mateo resident was an employee of Google.

So far this year, four measles cases have been confirmed in Santa Clara County and San Mateo County respectively. In Santa Clara County, vaccination rates among children are high, with over 97 percent on average in public schools and over 94 percent on average in private schools, according to the county’s website.

At least 555 measles cases, including 21 in California, have been confirmed across the country so far this year — the second highest number of cases reported in a single year since the disease was declared domestically eradicated in 2000, according to the Centers for Disease Control.

The CDC attributes the uptick in measles cases over the past decade to a rise in international travelers who get measles abroad and bring it back into the U.S. and pockets of vaccinated U.S. citizens.

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